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Bugs in Studies Viewed by Multiple Users

Hi,
I am part of a regular study group that meets via Skype and uses shared lichess studies to view games/puzzle solutions all together. For about the last six or seven months we have virtually ground to a halt because the boards are "haunted" with bizarre unexplained malfunctions - positions suddenly and without our doing anything change to different chess variants, the "play with computer" function suddenly comes on even after being turned off multiple times, entire chapters and sequences of moves suddenly disappear, ordinary positions suddenly transform into impossible or illegal positions. We often spend more of our sessions dealing with these bugs than we do analyzing. We have had no luck figuring it out. Most of the time, none of us are even touching the board, so it has nothing to do with syncing. Does anyone else have this problem? Some of us in the group are chess teachers and use for individual lessons, and have no problems. We all use lichess to create our own studies and again have not had significant problems. What could the cause of these "haunted" chess studies be and how can we fix it?
It's obviously a troll within your group. Don't let anyone into your study unless they are trustworthy, or else what they do is your responsibility. I don't have any advice except to find out who did it.
The "Members" tab of the study (on top left) can help figuring out who's modifying the study. There username will get a brief highlight.

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